First, you will have to make sure your able to view these emails by "From". If you can see them then simply right clicking that bar > Arranged By > Select from..then you can see everythingalphabetically by sender name.

If you do not have from listed, Right-click the bar and choose View Settings. Select Columns > Under select available columns from > Choose All mail fields. Locate From and add it to the active Column list.

Hope this helps.